Danuvia Danaddo
A new type of pocket calculator will be produced at Danuvia Industrial and Commercial Company. The new calculator called "Danaddo" issues with elegant, pocket-suitable construction. The calculator can solve addition and subtraction for eight digits, and has a great advantage to usable for any non-decimal operations too.
(Népszava, 2 April 1949.)
This kind of calculator is actually an improved version of gear bar adding machines: those has grooves turning back for guiding the stick to advance the next gear bar, the Danaddo has straight grooves with gear wheels which only rotates at the last position advancing the next gear bar automatically. The gear bars are built with steel springs which inhibit stopping between correct positions. For changing the operation from addition to subtraction and vice versa there is a movable aluminium board which masks the gaps are only for the other operation. If arrows are appearing in the place of digits, the gear wheel mechanism inhibits changing operation. The stick can be placed between the clearing lever and the body.
Addition, subtraction: The stick inserted to a hole next to the corresponding digit must be pulled down or pulled up, if the bar around the hole has red marking.
Arrows appearing: If arrows appear in place of digits, the corresponding gear bar must be pulled in the direction showed the arrow. (Multiple ten-carry)
Clearing: The clearing handle must be pulled up while all digits changes to zero.
Manufacturer: | Danuvia Ipari és Kereskedelmi Rt. (Hungary) |
OEM: | https://www.omegafamily.me/ (ismeretlen) |
OEM model: | n.a. |
Mfg. date: | 1949 |
Size: | 12,5×15,5×1,2 cm |
Weight (ready for operate): | n.a. |
Capacity: | 9 digit (for input and result) |
Setting: | direct setting |
Clearing: | with clearing lever |
Operating method: | gear bars, manual calculator with single automatic carry mechanism |